Bierhoff confident Chelsea happy with Ballack

Chelsea have left him out of their Champions League squad for the group stages.

But Bierhoff said: "It is difficult for us to judge what is happening at Chelsea, we have obviously not had anything official from them.

"But this is a matter for the club and player only, it is not for us to get involved and I think the first thing he must do is to concentrate on getting himself fit and then he will be able to play his best football again."